JP3947592B2 - Electrode for electrostatic treatment of water - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention prevents the generation of scales adhering to pipes or heat exchangers in a system for circulating, supplying, or discharging fluid, particularly in a cold / hot water supply system or an air conditioning / air conditioning system, and decomposes and eliminates accumulated scales. The present invention relates to an electrode for electrostatic treatment of water used in the above.
[0002]
[Problems to be solved by the invention]
In recent years, electrostatic field-type water treatment has attracted attention as one of physical water treatment methods, and an electrode for electrostatic treatment described in Japanese Patent Publication No. 7-16676 is known as a specific device thereof. . In other words, this electrode is installed in a tank, piping, etc. in an insulated state with water, and applying a high voltage prevents the generation of scale or disassembles and eliminates accumulated scale. . However, since the entire electrode for electrostatic processing described in the above publication is in the form of a single pipe, the water flow path becomes narrow when set in the pipe, so that not only is the load applied to the pump, May disturb the electrostatic treatment effect. There are also points to be improved, such as increasing the surface area of the electrode that comes into contact with water to increase the effect, and simplifying the structure to reduce the cost.
[0003]
The present invention has been made in view of the above-described problems, and the object of the present invention is to increase the surface area of the electrode that comes into contact with water to increase the effect of electrostatic treatment, and in the fluid. An object of the present invention is to provide an electrode for electrostatic processing of water that has the effect of reducing resistance and rectifying the flow of fluid to improve the efficiency of electrostatic processing, and further simplifying the structure.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, an electrode for electrostatic processing according to the present invention holds a plurality of metal long members having an insulating film on the surface and the rear end portions of these long members inserted in parallel. filling a resin block, and a metal boss press-fitting the resin block, and connecting means for connecting the ends after each elongate device inserted in the resin blocks to a high voltage power supply, the rear space of the boss to be And a filling resin for fixing the rear end portion of the elongated member in an insulated state .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
As described above , the electrostatic processing electrode of the present invention includes a plurality of metal long members having an insulating film on the surface, and a resin block that inserts and holds the rear end portions of these long members in a parallel state. A metal boss for press-fitting the resin block; a connecting means for connecting a rear end portion of each long member inserted into the resin block to a high-voltage power source; The structure includes a filling resin that fixes the rear end of the member in an insulated state. Needless to say, the long member may be fixed to the metal boss in an insulated state using only the filling resin without using the resin block.
[0006]
The long member is made of a metal having good conductivity such as an aluminum alloy or stainless steel, and the shape thereof may be any of a flat plate shape, a pipe shape, a rod shape, and the like. A resin film is coated on the surface of the long member, or an insulating film is formed by coating a resin.
[0007]
A protective cap may be attached to the end of the long member. This protective cap may be attached to the tip of each long member, but by attaching the tip portions of the long member so as to be connected to each other, the parallelism of the long member and vibration prevention, in particular resonance prevention, are intended. It is preferable to do so.
[0008]
In the electrode for electrostatic processing according to the present invention, a plurality of long metal members having an insulating film are used. Therefore, by increasing the number of the long members, the surface area of the conventional electrode can be made larger than that of the conventional pipe electrode. Can do. In addition, even if the overall size of the electrode is the same as that of a conventional pipe, the resistance in the fluid is greatly reduced. By arranging the long members in parallel, the flow of the fluid is rectified and electrostatic processing is performed. This has the effect of increasing efficiency. In terms of structure, a simple structure in which a plurality of long members are simply press-fitted into the boss via a resin block.
[0009]
【Example】
FIG. 1 is an explanatory view showing an example of an attachment state of an electrode for electrostatic processing, and FIG. 2 is a perspective view of a socket for attaching the electrode to a pipe.
[0010]
In FIG. 1, a pipe 1 is a pipe through which cold water or hot water passes in a cold / hot water supply system or an air conditioning / air conditioning system used in a building or plant, and an electrostatic processing electrode 2 is a socket welded to an elbow portion of the pipe 1. 5 is attached. Here, in order to allow the electrode 2 to be accurately and easily applied to the pipe 1, a socket 5 having a predetermined length welded with a wart 5a is specially manufactured as shown in FIG. The socket 5 can be drilled after the curved portion of the tip is applied to the attachment location of the pipe 1 to mark the exact hole position in the pipe 1 and the predetermined depth is maintained by the wart 5a. The welding work can be performed, and the electrode 2 is screwed and processed so as to be tightened at a position in a predetermined direction. The pipe 1 is made of a metal pipe and serves as a ground electrode for the electrostatic processing electrode 2 which is a positive electrode.
[0011]
When AC100V / 200V single-phase power is input to the high-voltage power supply device 3 with the safety device in the above-mentioned attachment state, this AC power is converted into a high-voltage DC (for example, 10000V, 1 mA) and passes through the high-voltage cable 4 to the electrode. A positive high voltage is applied to 2. This high voltage creates an electrostatic field in the water, and the organic and inorganic dissolved molecules, cations and anions contained in the water are each surrounded by water molecules and flow. The positive ions are attracted to the negatively charged tube wall but do not have enough force to adsorb, and the negative ions are repelled and do not approach the tube wall, so that positive and negative ions are separated and scale generation is prevented. The Similarly, the anion flows away without being adsorbed by the positive electrode, and the positive ion is repelled, so that the positive and negative ions are separated. Therefore, as long as the electric field exists, the generation of scale is prevented. In addition, the scale adsorbed on the tube wall is gradually decomposed and removed under the influence of weak electrolysis by the electric field. There is no such thing as free electrons being released into the water from the positive electrode, as is commonly said. The electrostatic field is more effective when the flow is rectified and the surface area of the positive electrode is larger.
[0012]
3 to 5 show a first embodiment of an electrode for electrostatic processing, FIG. 3 is a side view of the electrode, FIG. 4 is a front view of the electrode, and FIG. 5 is a sectional view of the electrode. 5 shows a cross section in a direction perpendicular to FIG.
[0013]
The electrode for electrostatic processing of this embodiment includes three strip-shaped metal plates 10, a resin block 11 that holds the metal plates 10 in parallel and at equal intervals, and a metal that press-fits the resin block 11. , The connecting member 13a and connecting line 13b as connecting means 13 for connecting the rear end of each metal plate 10 inserted into the resin block 11 to one high-voltage cable 4, and the space at the rear of the boss 12. And a filling resin 14 for fixing the rear end portion of each metal plate 10 in an insulated state.
[0014]
The metal plate 10 is made of a metal having good conductivity such as an aluminum alloy or stainless steel. In the present embodiment, one of the three metal plates 10 is thicker than the outer one, thereby changing the natural frequency from the outer side to prevent the entire resonance. These metal plates 10 are provided with an insulating film 10a on the surface after chamfering the corners except for the attachment portion of the connecting means 13. The insulating film 10a has a high dielectric breakdown voltage, a low relative dielectric constant, good weather resistance, water resistance and hot water resistance, and a heat sealable material such as perfluoroethylenepropylene copolymer (FEP), perfluoroalkoxyl. A tube made of a thermoplastic resin mainly composed of a fluororesin such as alkane (PFA) is used, and the tube is covered with a metal plate 10 by heat shrinking and covering. Experimentally, even if it is a high voltage of 10 kV, if the current is about 1 mA, the insulating film 10a may be a film having a thickness of 0.1 mm. However, considering practical strength, the thickness is 0.4 to 0.5 mm. desirable. After heat shrinking, the tip of the insulating film 10a is heat sealed and closed, and then a protective cap 10b is attached to the tip with an adhesive 10c such as epoxy resin (EP), and each metal plate 10 is attached with a bolt 10d and a nut 10e. They are connected to each other at their tip portions. The protective cap 10b is made of an adhesive resin having weather resistance, water resistance, and hot water, for example, a resin such as polyvinylidene fluoride (PVDF), polysulfone (PSF), polycarbonate (PC) or the like. Alternatively, it may be made of a metal such as stainless steel or brass.
[0015]
The resin block 11 is made of an engineering plastic having weather resistance, water resistance and hot water, such as polyvinylidene fluoride (PVDF), polysulfone (PSF), silicon resin (SI), etc., and each metal plate 10 covered with an insulating film 10a. Three through-holes are opened with dimensions that do not contain any gaps. Then, after inserting the three metal plates 10 into the through holes, the rear end portion is fixed and electrically connected by the connecting member 13a, and the connecting wire 13b is attached.
[0016]
Boss 12 is stainless steel, or engineering plastics such as brass, for example polyphenylene elm Nsarufaido (PPS), with a hollow fabricated in the polyetheretherketone (PEEK) or the like, tapered screw portion 12a and a hexagonal shape in the outer periphery Screw head 12b is provided. And the part of the metal plate 10 of the electrode is inserted from the socket 5 attached to the elbow part of the pipe 1 by electric welding or the like, and the screw part 12a is screwed to the male screw on the inner surface of the socket 5 so as to fix the electrode. It has become. In this case, a seal tape is wound around the screw portion 12a, and the screw portion 12a is screwed into the socket 5 to fix the electrode to the socket 5 in a sealed state and in a predetermined direction. For positioning, an appropriate mark may be provided on the head 12b of the boss 12.
[0017]
The resin block 11 has an insertion portion 11a having an outer diameter slightly larger than the inner diameter of the boss 12 and a cap portion 11b having a larger diameter on the rear side. Therefore, by pushing the insertion portion 11 a into the boss 12 in a predetermined direction, the resin block 11 is firmly fitted into the boss 12 with the cap portion 11 b being in contact with the tip of the boss 12. The resin block 11 is preferably fixed to the boss 12 so as not to come out with the embedded screw 11c. Further, when the resin block 11 is inserted into the tip of the boss 12, a taper widening portion 12 c is formed to facilitate the insertion of the resin block 11. Furthermore, the boss 12 is easy to insert when heated in advance, and contracts when cooled to firmly fix the resin block 11.
[0018]
In this way, the metal plate 10 can be attached in a state of protruding from the boss 12 only by press-fitting the resin block 11 into the boss 12. As a result, the structure is simple, the number of parts used is small, the manufacturing process is greatly simplified, and the production cost is reduced.
[0019]
After the resin block 11 with the metal plate 10 is fitted and fixed to the boss 12, a filling resin 14 such as epoxy resin (EP) is cast from the rear of the boss 12, and the rear end portion of each metal plate 10 is connected to the boss 12. 13 and securely fixed in an insulated state. Then, the other end of the connection line 13 b attached to the connecting member 13 a is attached to the high voltage connector 15, and this is fixed to the boss 12 with the screw 16. In FIG. 5, reference numeral 12d denotes a widening portion provided to prevent the filling resin 14 from being detached.
[0020]
6 to 8 show a second embodiment of the electrode for electrostatic processing. FIG. 6 is a side view of the electrode, FIG. 7 is a front view of the electrode, and FIG. 8 is a sectional view of the electrode. 8 shows a cross section in a direction perpendicular to FIG.
[0021]
The electrode for electrostatic processing of this embodiment is composed of eight metal pipes 20, a resin block 21 that holds the metal pipes 20 in parallel and at equal intervals, and a metal boss that press-fits the resin block 21. 22, a connecting member 23 a and a connecting member 23 b as connecting means 23 for connecting the rear end portion of each metal pipe 20 inserted into the resin block 21 to one high-voltage cable 4, and a space at the rear portion of the boss 22. And a filling resin 24 for fixing the rear end portion of the metal pipe 20 in an insulated state.
[0022]
The metal pipe 20 is made of the same material as that of the metal plate 10, that is, a metal having good conductivity such as an aluminum alloy or stainless steel. The metal pipe 20 is provided with an insulating film (not shown) on the surface, and a ring-shaped protective cap 20a is attached so that the metal pipes 20 are connected to each other at their tips. A tube made of the same material as that described above is used as the insulating film, and a plug 20b made of the same resin as the protective cap 20a is inserted into the tip of the metal pipe 20, and then the tube is thermally contracted in a state of covering the metal pipe 20. By forming. After heat shrinking, the tip is heat sealed or bonded, and then a protective cap 20a made of the same material as described above is put on the metal pipe 20 via an adhesive made of epoxy resin (EP) and connected to each other.
[0023]
The resin block 21 is made of the same material as that of the resin block 11 described above, and has eight through-holes having dimensions that do not cause a gap because each metal pipe 20 covered with an insulating film is just inserted. Then, after inserting the eight metal pipes 20 into the through holes, the rear end portion is fixed and electrically connected by the connecting member 23a, and the tip of the cable 4 is attached to the connecting member 23a.
[0024]
The boss 22 is made of the same material as that of the boss 12, and has a tapered screw portion 22a and a hexagonal screw head 22b on the outer periphery. And the part of the metal pipe 20 of the electrode is inserted from the socket 5 attached to the elbow part of the pipe 1 by electric welding or the like, and the screw part 22a is screwed to the male screw on the inner surface of the socket 5 so as to fix the electrode. It has become.
[0025]
The resin block 21 is larger in the axial direction than the resin block 11. As in the resin block 11, an insertion portion 21 a having an outer diameter slightly larger than the inner diameter of the boss 22 and a cap portion 21 b having a larger diameter on the rear side are provided. Have. Therefore, the point that the resin block 21 is firmly fitted into the boss 22 in a state where the cap portion 21b is in contact with the tip of the boss 22 by pushing the insertion portion 21a into the boss 22 in a predetermined direction is the same. Further, the boss 22 is formed with a tapered cut-out portion 22c at the tip thereof to facilitate the insertion of the resin block 21.
[0026]
After the resin block 21 with the metal pipe 20 is fitted and fixed to the boss 22, it is filled with a filling resin 24 such as epoxy resin (EP) and the rear end portion of each metal pipe 20 is fixed together with the connecting member 23a in an insulated state. . Reference numeral 25 denotes a rubber bush, and reference numeral 26 denotes a casing. These are used to clamp the high-voltage cable 4 with screws 27 and are fixed to the boss 22. In FIG. 8, reference numeral 22 d denotes a tapered widened portion provided to prevent the filling resin 24 from being integrally removed via the resin block 21 and the metal pipe 20.
[0027]
Although the present invention has been described with reference to two examples, the present invention is not limited to these examples, and the design may be changed as appropriate within the scope of the claims. Needless to say. For example, in the above electrode, a metal plate or a metal pipe is used as the long member, but a metal rod may be used, or a metal plate or a metal pipe of the embodiment may be deformed. Moreover, it is also possible to use the thing of the flat cable shape which used the piano wire etc. as conducting wire as a long member with an insulating film.
[0028]
【The invention's effect】
As described above, according to the electrode for electrostatic processing of the present invention, since the entire surface area can be increased by increasing the number of long members to be used, the effect of electrostatic processing can be increased. Can do. In addition, the resistance of long members in the fluid is significantly less than that of conventional pipes, so there is no need to put a burden on the pump that transports the fluid, and large electrodes are installed even for small-diameter pipes. It becomes possible. Furthermore, as a result of rectifying the fluid flow by making the elongated member parallel to the fluid flow, the water treatment performance of the electrode is improved. The production cost can be reduced because of the simple structure in which the long member is simply sandwiched between the resins.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an example of an attachment state of an electrode for electrostatic processing according to the present invention.
FIG. 2 is a perspective view of a socket for attaching an electrode to a pipe.
FIG. 3 is a side view showing a first embodiment of an electrode for electrostatic processing.
FIG. 4 is a front view of the same.
5 is a cross-sectional view of the electrode for electrostatic processing shown in FIG.
FIG. 6 is a side view showing a second embodiment of the electrode for electrostatic processing.
FIG. 7 is a front view of the same.
8 is a cross-sectional view of the electrostatic processing electrode shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Piping 2 Electrostatic processing electrode 3 High voltage power supply device 4 High voltage cable 5 Socket 10 Metal plate 10a Insulating film 11 Resin block 12 Boss 13 Connection means 14 Filling resin 15 Connector 16 Mounting screw 20 Metal pipe 21 Resin block 22 Boss 23 Connection means 24 Filling resin 25 Rubber bush 26 Casing 27 Screw

Claims (2)

A plurality of metal long members having an insulating film on the surface, a resin block for inserting and holding rear ends of these long members in a parallel state, a metal boss for press-fitting the resin block, and the resin Connecting means for connecting the rear end portion of each long member inserted into the block to a high-voltage power supply, and filling resin for filling the space at the rear portion of the boss and fixing the rear end portion of the long member in an insulated state. An electrode for electrostatic treatment of water, comprising: The electrode for electrostatic treatment of water according to claim 1, wherein a protective cap is attached to the tip of the long member.

Images